Method of producing a matrix



H. A. HERR METHOD 0F PRODUCING A MATRIX Apr. 16,1923. mam@ l Filed JinA 2, 1925 2 sheets-sheet 2 @Yy/C977@ f7 /f j2me/Z231 l To all whom t may concern Patented .pre l0, i923..

i frs HENRY n. Hnnmor CHICAGQ'ILLINQIS.

METHOD or rnonucrne Marnix Application mea January 2, 192e; 4 serial No. 610,212.

Be it known that I, HENRY A. I-IERR, a

cago, in the county of Cook and State-of Illinois, have invented certain new-and useful Improvements in Methods of Producing a Matrix, of which the following is a specification. 4

This invention relates to an improved method or process of producing or forming a matrix for use in the' preparation of a printing plate.

Heretofore in the manufacture of printing plates it has not been possible to produce a plate, the printing surface of which is so nearly perfect*l that the printer may perform the printing work therefrom just as it is received fronifthe maker, due to the fact that certain portions of the face of the plate known as high lights are not alwa s properly positioned with respect Vto t e other portions of the-printing surface of the printing plate known as `solids, that the solids will print heavier than the high light portions. l

The methods heretofore employed in preparing the plates toovercome these diliiculties so that the desired impression or printing may be obtained therefrom consists in an operation commonly known as make ready and which consists in underlaying the plate and overlaying on the impression member. Other methods consist in cutting away portions of a proof which are to be printed heavier and adding to the portions of the proof sheets pieces of paper or the like at'those portions .of the impression that are to print lighter.

These proof sheets thusv prepared have been employed as a matrix which is applied to the face of the plate and pressure exerted thereupon to produce in the face of the'plate a series of depressions and elevations reverse to the depressions and elevations in the matrix.

The preparation of the make ready in these prior methods and in all other methods, is not only a laborious undertaking but is very expensive.

To overcome thesel difficulties and objections and to provide an improved method of producing a matrixwliich will obviate the necessity of the building up or cutting awayl of roofs and save the expensive make rea' y operation, and whereby the amountof labor necessary and the expense of producing the matrix-is materially reduced, is

one of the objects of the present invention.

A further object is to provide an improved method 'of producing a matrix of this charlacter which will not be destroyed whenonce used, but which may be used over again.

substantially the herein described method of forming a matrix as shown in the accompanying drawings illustrating a method or process of carrying this invention into operation. j

In the drawing I Figure l illustrates the face. of the printing. or electrotype plate which is to be treated with this improved method or process.

Figure 2 is a sectional view taken on line 2 2, Figure l. y

Figure 3 is ia View of the obverse face of the matrix. l

Figure 4 is a sectional view taken on line 4 4, Figure 8.

Figure 5 is a view of a proof sheet which has been pulled from the plate shown in Figure 1.

Figure 6 is a sectional view taken on line 6 6, Figure 5.

Figure 7 is a view of. the reverse faceof the matrix. x

Figure 8 is a sectional view taken on line 8--8, Figure 7 Figure `9 is asectional view of the matrix with the proof sheet in position to offset the design thereupon on the 'back of the matrix.

Figure l() is a sectional view of the matrix after the Asame has been etched on both sides. Figure 1l is a sectional view of the printingplate with the matrix placed against the back thereof.

Throughout the-specification and claims be construed broa'dlyto include not only etching but to cover any other process of a similar' nature, and any other method of treating the surfaces of the matrix vfor forming thereon elevations and depressions in the illustration-or design produced thereupon.

In carrying this improvedv method into operation a relief plate or electrotype plate vreproductions are to be made. or pattern consists of p ortions'l? technically known as solids and which portions arepto- .be printed heavier than other portions 18, printing surface of the plate, after having is employed having upon its front a picture or reproductionproduced in any manner or by any process, certa1n' portions of whlch.`

deslgn YorA reproduction HVconstituting high lights or portions .to :be 4printed lightand other portions which constitute what ist'echnically known as solids an'd'which solids are to be printed heavieror darker than the j its face in any ordinary and welll-known `mannerthe design or pattern 16, from which technically known 'as high lights, it being understood that in the drawings the various figures are scale.

This improved method" consists inV first producing a matrix .19, the obverse vface of which is illustrated in Figure 3, and the re- Verse face is illustrated in Figure 7 the completed matrix `being'illustrated in Figure 10'.

' rihis improved vmatrix may be formed from any materia-l suitable vfor the,purv

, pose' but is preferably'constructed vofgsheet material such as zinc, copper, or the like.

f The first stepin the operation consists in pulling -a proofnponthe matrix 'sheet 19 from the face of theprinting plate 15, v which may be donein the usual 'mannerof producing a proof, that is by. an impression of the design on the printing plateupon the matrix, resulting in the production of the design illustrated generally bythe reference numeral-20 on the face of the matrix. Another proof is then taken or" pulled from the face of the printing plate 15 upon another sheet oft material 21, which latter may beA of Celluloid or any suitable-material from which the design 22 vproduced thereupon by impression of the printing. plate, may be. readily transferred. 'The' sheet 21 is then placed againstthe back ofthe matrix sheet 19, as shown in Figure 9, so that the design 22 will register with the design 2() on the face of the matrix plate 19,'and which design is o iset in any suitable manner upon the reverse face of the matrix plate 19 to .produce the design 23. This production of' 'the desigri 2 3 on the reverse face of the so as .to form elevations 24 and depressions 25 on both faeesof thematrix7 the eleva- This design illustrated' on an exa'ggerated 'tions corresponding lwith the solids on solids.

'By etching-the matrix on both faces thereof the portions'ofthe matrix for displacing the printingplatefor producing. the solids.

will'lie-substantially twice the lthickness of the remaining portions of the matrix corre sponding'to the high light portions of'the Aprinting platepwiththe res-ult that when pressure iseXerted upon---the'matrix to shapev the lprinting surface, the'solidswill projectI for axconsiderable distance'. above .the high light portions` and these'parts wil-lhe-clearly definedwhenthe impression -is-made by the been so treated. 'This resultv cannotbe `obtained when the-matrix etched von one side enough to-produce such -a 'reagainst the back or the reverse face ofthe printing plate 15 'so that the depressions 25 will register with the high light portions 18 of the printing plate and theelevations :24 will register with the solid port-ions 17 of the printing plate 15.

What is claimed as-new-is:-

.Q1-Q.` The-method of producing a matrix for u'se' inf-"the treatment of a printing plate which consists in Aprinting from a printing plate-'the design thereon upon the surface of a metallicsheet, then 'from the printing plate .and upon .another sheet of material pulling another copy'of the'design, then placing the proof face of the lsecond sheet against the back ofthe metallicsh'eet so that the design yon the proof face will register with the design on the obverse face of the metallicI plate, then causing theidesign on the second sheet to offset on' the back vof the metallic sheet. and then etching -both faces of the metallic sheet.

2. The method of producing a matrix for use in the treatment of a printing plate Awhich consists in printing from av printing plate the design thereon upon the surface of a metallic. sheet, then upon a sheet of 'celluloid or similar material pulling another .copy of the design from the printing plate,

then ofisettingthe printed' design from the Celluloid sheet upon the back ofthe metallic HENRY A. unan.

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